In general, whats the difference between say, double platinum and iridium plugs?
The reason I'm asking is because I'm about to do the plugs on the rents' '04 Town Car and those Triton engines are a chore to change the plugs on. They have the coil-over-plug setup, plus the back few are still hard to get to, even when you remove the fuel rails and such. I know this because of our F-150!
The book says its supposed to take over 2 hours, which means me and my sweet time will take all day.
I don't want to have to do this again for a really long time, so I was going to go with the Double Platinums because they should last well over 100,000 miles.
It's my understanding that Iridium's perform overall better, but don't last as long. Am I correct? <<< Here's the question (for those who don't wish to socialize)
Double Platinums - NGK Spark Plugs 7740 - NGK Laser Platinum Spark Plugs - Overview - SummitRacing.com
Iridium - NGK Spark Plugs 6044 - NGK Laser Iridium Spark Plugs - Overview - SummitRacing.com
And if you're wondering, the Passat's plugs get changed every 40,000, whenever I get there.
Yes I really do care this much about spark plugs.